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经营范围
发明名称
OPTICAL CIRCULATOR
摘要
申请公布号
EP0491607(A3)
申请公布日期
1993.03.31
申请号
EP19910403393
申请日期
1991.12.13
申请人
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人
KOGA, MASAFUMI
分类号
G02B5/30;G02B27/28;G02F1/09;(IPC1-7):G02B27/10;H04B10/02
主分类号
G02B5/30
代理机构
代理人
主权项
地址
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